Standard Lemma guide

semicentennial

adj · noun · 4 senses · updated from the 2026-07-25 local source snapshot

Definitions and examples are grouped by meaning. Pronunciation, history, word forms, translations, descendants, synonyms, antonyms, derived terms, and related words appear whenever the source provides them.

Sound

Pronunciation

Each Play button uses your device's default local English voice, or a natural local fallback. The selected voice name appears after playback. This is synthesized speech, not a source recording.

  • General-American: /ˌsɛˌmaɪsnˈtɛniəl/
  • General-American: /ˌsɛmisnˈtɛniəl/
  • General-American: /ˌsɛˌmaɪsənˈtɛniəl/
  • General-American: /ˌsɛmisənˈtɛniəl/
  • Received-Pronunciation: /ˌsɛmɪsɛnˈtɛnɪəl/

1

adj

Meaning 1

Of or related to a 50th anniversary, occurring every 50 years.

Definition source: English Wiktionary via Wiktextract

Usage: not-comparable

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

2

noun

Meaning 2

A 50th anniversary.

Definition source: English Wiktionary via Wiktextract

Examples

  • The city celebrated its semicentennial last year.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

3

adjective

Meaning 3

of or relating to or marking the 50th anniversary

Definition source: Princeton WordNet 3.0

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: semicentenary

Antonyms: none provided

4

noun

Meaning 4

the 50th anniversary (or the celebration of it)

Definition source: Princeton WordNet 3.0

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: semicentenary

Antonyms: none provided

Broader terms: anniversary, day of remembrance

History

Etymology

From semi- (“half”) + centennial (“100 year, 100th anniversary”), q.v.

Across languages

Translations

1 source translations are retained for this English entry.

  • Italian: semisecolare — occurring every 50 years